Oath
Oath (ōth) , noun
[Old English othe, oth, ath, Anglo-Saxon āe; akin to Dutch eed, Old Saxon ēe, German eid, Icelandic eier, Swedish ed, Danish eed, Gothic aiþs; compare OIr. oeth.]
1.
A solemn affirmation or declaration, made with a reverent appeal to God for the truth of what is affirmed.
I have an oath in heaven
An oath of secrecy for the concealing of those [inventions] which we think fit to keep secret.
2.
A solemn affirmation, connected with a sacred object, or one regarded as sacred, as the temple, the altar, the blood of Abel, the Bible, the Koran, etc.
3.
(Law) An appeal (in verification of a statement made) to a superior sanction, in such a form as exposes the party making the appeal to an indictment for perjury if the statement be false.
4.
A careless and blasphemous use of the name of the divine Being, or anything divine or sacred, by way of appeal or as a profane exclamation or ejaculation; an expression of profane swearing.
A terrible oath